/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package palma.api;

/**
 * Responsible for retrieving Principals.
 * 
 * @param <P>
 *          the principal type
 * @param <C>
 *          the credentials type
 */
public interface PrincipalService<P, C> {

  /**
   * Get the Principal information based on the identifier/ password in the
   * credentials
   * 
   * @param c
   *          the credentials (e.g. username and password or some other type of
   *          authentication)
   * @return the Principal
   */
  P getPrincipal(C c);

}